Sixteen Democratic senators who voted for the Affordable Care Act are asking that one of its fundraising mechanisms, a 2.3 percent tax on medical devices scheduled to take effect January 1, be delayed. Echoing arguments made by Republicans against Obamacare, the Democratic senators say the levy will cost jobs — in a statement Monday, Sen. Al Franken called it a “job-killing tax” — and also impair American competitiveness in the medical device field.